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Title: Direct-write 3D printing of NdFeB bonded magnets

We report a method to fabricate Nd-Fe-B bonded magnets of complex shape via extrusion-based additive manufacturing (AM), also known as 3D-printing. We have successfully formulated a 3D-printable epoxy-based ink for direct-write AM with anisotropic MQA NdFeB magnet particles that can be deposited at room temperature. The new feedstocks contain up to 40 vol.% MQA anisotropic Nd-Fe-B magnet particles, and they are shown to remain uniformly dispersed in the thermoset matrix throughout the deposition process. Ring, bar, and horseshoe-type 3D magnet structures were printed and cured in air at 100°C without degrading the magnetic properties. Lastly, this study provides a new pathway for fabricating Nd-Fe-B bonded magnets with complex geometry at low temperature, and presents new opportunities for fabricating multifunctional hybrid structures and devices.
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [1] ;  [5] ;  [2]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Mechanical, Aerospace, and Biomedical Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
  3. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
  4. Ames Lab., Ames, IA (United States). Critical Materials Inst.
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Publication Date:
Report Number(s):
Journal ID: ISSN 1042-6914
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Materials and Manufacturing Processes
Additional Journal Information:
Journal Volume: 33; Journal Issue: 1; Journal ID: ISSN 1042-6914
Research Org:
Ames Laboratory (AMES), Ames, IA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office (EE-5A)
Country of Publication:
United States
36 MATERIALS SCIENCE; 3D printing; bonded magnets; direct-write; magnetic properties; NdFeB
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1408633